Natural13C distribution in oil palm (Elaeis guineensisJacq.) and consequences for allocation pattern
| Autor: | Nuzul Hijri Darlan, Diana Sketriené, Emmanuelle Lamade, Caroline Mauve, Jaleh Ghashghaie, Rosario Lobato Rodrigues, Chantal Fresneau, Guillaume Tcherkez, Marlène Lamothe-Sibold |
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| Rok vydání: | 2015 |
| Předmět: |
0106 biological sciences
0301 basic medicine Ecophysiology Sucrose biology Physiology Carbon fixation Heterotroph food and beverages Plant Science Elaeis guineensis biology.organism_classification 01 natural sciences 03 medical and health sciences chemistry.chemical_compound 030104 developmental biology chemistry Botany Respiration Palm oil Palm 010606 plant biology & botany |
| Zdroj: | Plant, Cell & Environment. 39:199-212 |
| ISSN: | 0140-7791 |
| Popis: | Oil palm has now become one of the most important crops, palm oil representing nearly 25% of global plant oil consumption. Many studies have thus addressed oil palm ecophysiology and photosynthesis-based models of carbon allocation have been used. However, there is a lack of experimental data on carbon fixation and redistribution within palm trees, and important C-sinks have not been fully characterized yet. Here, we carried out extensive measurement of natural (13) C-abundance (δ(13) C) in oil palm tissues, including fruits at different maturation stages. We find a (13) C-enrichment in heterotrophic organs compared to mature leaves, with roots being the most (13) C-enriched. The δ(13) C in fruits decreased during maturation, reflecting the accumulation in (13) C-depleted lipids. We further used observed δ(13) C values to compute plausible carbon fluxes using a steady-state model of (13) C-distribution including metabolic isotope effects ((12) v/(13) v). The results suggest that fruits represent a major respiratory loss (≈39% of total tree respiration) and that sink organs such as fruits are fed by sucrose from leaves. That is, glucose appears to be a quantitatively important compound in palm tissues, but computations indicate that it is involved in dynamic starch metabolism rather that C-exchange between organs. |
| Databáze: | OpenAIRE |
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